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The range of percent composition of unimbibed seed weight is given to include values reported in the literature. Modified from Trelease and Domatl (1984). The range of percent composition of unimbibed seed weight is given to include values reported in the literature. Modified from Trelease and Domatl (1984). cell division preceded cell elongation in embryo growth in Japanese black pine seeds (Goo, 1952). In cherry laurel, however, cell division and cell elongation began more or less...

Seed Composition

Seeds contain variable quantities of foods in the form of carbohydrates, fats, and proteins. Seed starches are stored as granules in the endosperm, megagametophyte, and cotyledons. Lipids occur in fat bodies of seeds as fats and oils, depending on the proportions of saturated and unsaturated fatty acids present. Three-fourths or more of the seed proteins are stored in protein bodies, organelles 1 to 20 fim in diameter that contain a pro-teinaceous matrix and are bound by a single membrane. In...

Seed Dormancy

Mature seeds of some species of woody plants of the temperate zone germinate rapidly if planted under favorable environmental conditions, but seeds of most species exhibit some degree of dormancy. Hence, they do not germinate promptly even when placed under the most favorable environmental conditions. The seeds of most tropical species of woody plants have little or no dormancy, but some remain dormant for years Alexandre, 1980 . In Malaysia, all the seed of two-thirds of the woody species...

Production of Seedlings in Nurseries

Growth and survival of seedlings planted in the field are influenced by seedling quality, which varies appreciably with seed quality, nursery practices, and handling of nursery stock during lifting from the nursery and in outplanting. The quality of seedlings reflects integration of many physiological and morphological characteristics. Ritchie 1984 divided components of seedling quality into material attributes e.g., dormancy status, water relations, nutrition, and morphology and performance...